Randomized quad switching
US9584151B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2016 |
| Grant date | Feb 28, 2017 |
| Priority date | — |
| Expiry date | Mar 1, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/742
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Reducing distortions in a digital-to-analog converter is a challenge for circuit designers. For current steering digital-to-analog converters (DACs), a quad switching scheme has been used to remove code-dependent glitching which is otherwise present in dual switching schemes. However, due to various impairments in the circuit, e.g., mismatches in the transistors, some code-dependent distortions remain even when a quad switching scheme is implemented. To address this issue, the quad switching scheme can be randomized to improve dynamic linearity while relaxing driving circuitry design and power constraints. Advantageously, randomization reduces the code dependency of the distortions and makes the distortions appear more noise-like at the output of the DAC.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.